"Mozilla today announced Boot to Gecko , a very ambitious project that aims to create a 'complete, standalone operating system for the open web'. This project's goal is to develop what seems like a ChromeOS-like operating system where all the apps are based on HTML5."

What are you going to do of your Galaxy S or iPhone4 in two year's time, when it won't have been updated for a long time? Ditch it?

B2G sounds like a good alternative ROM to install, far less complicated than maintaining a custom Android AOSP build (if Google does not cut access to the code source, anyway). Well, except for the iPhone4 whose non-removable battery will be fried by then.